UI polish: amber theme, smooth spectrum, MIDI LED, VU tuning

- Rename section labels: COMPRESSOR → COMPRESSION, AUTO-PAN → PANNING
- Replace spectrum analyzer bars with smooth gapless filled wave
- Use gold (#c59c07) for wave/spectrum strokes and piano roll active keys
- Amber CRT-style patch LCD with dark background and gold dot-matrix text
- Add MIDI signal LED with glow between semi and scale controls
- Reduce VU meter sensitivity (5x → 1.5x) and match amber gradient theme
- Add subtle glow behind section and sub-section boxes
- Fix Compressor.h class name and PluginProcessor include to match

Source/PluginEditor.h

@@ -67,6 +67,15 @@ private:
     juce::String text = "INIT";
 };
 
+class MidiLed : public juce::Component, public juce::Timer {
+public:
+    explicit MidiLed(ChromaFlockProcessor& p) : processor(p) { startTimerHz(30); }
+    void paint(juce::Graphics& g) override;
+    void timerCallback() override { repaint(); }
+private:
+    ChromaFlockProcessor& processor;
+};
+
 class PianoRollComponent : public juce::Component, public juce::Timer {
 public:
     explicit PianoRollComponent(ChromaFlockProcessor& p) : processor(p) { startTimerHz(60); }
@@ -129,6 +138,7 @@ private:
     juce::Label osc1Label, osc2Label, filterLabel, envLabel, fEnvLabel, globalLabel;
     juce::Label fxLabel, lfoLabel, fx2Label;
     juce::Label scaleLabel;
+    juce::Label midiLabel;
     juce::Label octaveTransposeLabel, semitoneTransposeLabel;
 
     juce::ComboBox octaveTransposeBox, semitoneTransposeBox;
@@ -167,6 +177,7 @@ private:
     // Preset menu
     juce::TextButton presetButton{"PRESET"};
     PatchLCD patchLCD;
+    MidiLed midiLed;
     juce::TextButton prevPresetButton{"<"}, nextPresetButton{">"};
     juce::TextButton randomizeButton{"RANDOM"};
     int currentPresetIndex = 0;